Answers

Add 72/21 and 35/45

1^st number: 3 9/21, 2^nd number: 35/45

72/21 + 35/45 is 265/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 45 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 21 × 15 = 315,
   72/21 = 72 × 15/21 × 15 = 1080/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
   35/45 = 35 × 7/45 × 7 = 245/315
4. Add the two like fractions:
   1080/315 + 245/315 = 1080 + 245/315 = 1325/315
5. 1325/315 simplified gives 265/63
6. So, 72/21 + 35/45 = 265/63
   In mixed form: 413/63

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